This worked perfectly on my 10 gallon tank. The cutouts took a little time and a small amount of sanding to make it look smooth, though I don’t think that anyone would notice but me. It looks so much better than the old hood with the fluorescent light, and since I cut the areas for the filter, air pump, and heater with little excess opening, the water doesn’t evaporate, and there’s no more algae on the lid.